Why it's awesome: Earth's oceans are home to many secretive and unusual creatures that humans rarely see — including giant ...

The infamous box jellyfish developed its frighteningly powerful venom to instantly stun or kill prey, like fish and shrimp, so their struggle to escape wouldn’t damage its delicate tentacles.

While sea jellies are often casually called jellyfish, many scientists prefer to stick with just “jelly” because the animals aren’t fish. The gelatinous jelly is massive, but it’s not a ...